Gun-mounting.



B. T. HAMILTON. GUN MOUNTING. APFfLiQATION man rmzz. 191s.

Patented 15, 1919.

2 SHEE HEET l- B. T..HAMILTO N. GUN MOUNTING. APPLICATION, FILED FEB, 27. 1919. 1,300,264. Patented Apr. 15,1919.

2 S.HEETSSHEET 2- To all whom z't may concern Beiit known that I, BELTON TATTNALL Heiumron; major R. A. F., a subject of the Kingof England, and resident of London, England," have invented certain new and useful Improvements in Gun-Mountings, of which the following is a specification.

Thisiinvention relates to gun mountings or non-recoil guns, as for instance of the Davis type, and has for its object to prentl the gunner from inadvertently laying heggunin such a position that structures tdjacent to the gunmay be damaged by the rticularly intended for use on aircraft.

I. ccordin'g to this invention the gun is car ried' byhorlzontal trunnions on a crosshead hich is. rotatable on a' fixed vertical pivot andon the upper end of this pivot is fixed a memberjwhich is formed with one or more r es a lever .which is downwardly directed so as to bear on the projecting part or parts of. the fixed member whereby the elevation ordeprjession of the gun will be limited for 1 certain positions of the gun about'the vertical pivot as determined by the formation of. the fixed member. A substantially circular plate-is fixed ,b'elowthe crosshead and 'r'ovided, at or;nearits periphery with tchesforlprojections which are relatively positions- 0f the; extremities of the camshaped part or parts carried by the pivot.

catchadapted'to engage the periphery of thisplate Qis-carriedby thecrosshead in a position which Ibearsthesame relation to the esofjthe camshaped partor parts. In

fixed pivot and: the periphery of the circular throughoutianfarc which is equal to and coincides'with the 'arc of the fixed projection. While "this-reduced portion is engaged by a catch carriedby. the-crosshead, the ena'rc through which the gun can be trained "henit has been so turned about the pivot gun lever is inoperative engagewl'thgthef'projecting cam. In another truction the pivot is provided with two tun-shaped members which project laterally Specification of Letters Patent.

invention into practice.

rearshot or blast. The mounting is more 1 c rcular plate and catch on the crosshead.

cam-shaped; projecting parts. The gun carsitioned'to' correspond with the relative cjbetween thefnotches or projections as the 1 position of the-lever which projects downwardlyi from the .gun bears to the extremijprolonged to the rear, is prevente onefconstructionasingle cam member pro-- ects laterally;from gtheupper end of the ed 'plate below the crosshead is cut away I gagenient of these parts serves to limit the ITED srxrns PATENT orrict.

GUN-MOUNTING.

with a transverse slot or passage between them The lever carried by the gun is of such a .width as will allow it to pass freely through this passage when the gun has been turned about the pivot so as to bring the lever into coincidence-with the passage.

Patented Apr. 15,, 1919.

Application filed February 27; 1919. Serial No. 279,587. i v

Th accompanying drawings illustrate by way. of example two alternative constructions which may be adopted in putting the In these draw- 1ngs: I

-Figure 1 is a perspective view showing one construction.

, Fig. 2 shows diagrammatically in plan the prises a crosshead A which carries in bearings A the trunnionsof the gun B.j The crosshead is rotatable on a vertical pivot C which is fixed in some convenient manner on the aircraft or elsewhere as required.

The pivot 0 projects through the center of the crosshead and has fixed upon its upper extremity an arc-shapedcam D. Rigidly attached to the gun and centrally below the trunnion axis is a downwardly projecting lever E which when the gun is given the periphery of the cam D. As shown in Fig. l'the cam is arranged and shaped to insure safety for at Davis gun mounted on the prow or nose of a twintractor or a pusher biplane. The contour ofthe cam D is designed so that the axis of the n, if from passing nearer than 3 feet above the leading edge of the top plane duri'ngtraining, untilsuch degree is reached that the prolonged axis of the gun is 3, feet in advance of the leading wing tip. At this point thecam is cut away so that .the gun may then be further elevated to any extent desirable. Various shapes or contours of cams may be used according to conditions of deslgn of the aircraft upon which the gun is mounted.

The pivot C upon which the crosshead A turns has fixed to it below, the crosshead socket a plate Fhaving apart F cut away so forming stops or projections F in its tam member secured to the upper end of he pivot, a lever mounted on the gun and cooperating with the cam member to limit plate secured to the pivot below the cross- "head, a spring controlled member carried by the icrosshead and cooperating With the plate to restrict the are through Which the -cr0sshead and gun can be turned about the the elevation and depression of the gun, a

pivot this restricted arc coinciding with the 10 position in Which the lever is in operative engagement with the cam member, and means for disengaging the spring controlled member from the plate as set forth.

In testimony whereof I have signed my 15 name to this specification.

- BELTON TATTNALL HAMILTON.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents,

' Washington, D. G. 

